This is a uni STYLE FIT gel ink ballpoint pen refill. I used to love these and stocked up on refills, but I haven't been using stationery as much lately, so I'm selling these since I can't use them all. There are 4 refills, and the colors and thicknesses are as follows: * Orange 0.28mm: 1 * Violet 0.28mm: 1 * Sky Blue 0.28mm: 1 * Light Blue 0.38mm: 1